JEE Main 2016 Physics question
When photons of wavelength are incident on an isolated sphere, the corresponding stopping potential is found to be . When photons of wavelength are used, the corresponding stopping potential was thrice that of the above value. If light of wavelength is used then find the stopping potential for this case:
Answer: (4)
Solution
Einstein's equation gives . Writing it for the first two cases,
= φ + eV, = φ + 3eV.
Subtracting eliminates : , so $eV =
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